Metal complexes based on substituted aliphatic acid derived from a Diels-Alder adduct: Synthesis and potential ratiometric luminescent temperature sensor of d10 complex

Abstract

A condensation reaction between the Diels-Alder adducts of anthracene and maleic anhydride with β-alanine leads to the formation of a new compound, HL. A one-pot reaction of HL with Cu(OAc)2·H2O afforded the formation of mononuclear complex, [CuL2(H2O)3] (1). By leaving the blue crystal of 1 in high concentrated methanolic vapor resulting the formation of pale green crystal of dinuclear complex, [Cu2(µ-L)4(MeOH)(H2O)] (2). This observation indicated the solvent-vapor mediated single-crystal-to-single-crystal (SCSC) transformation that promoted nuclearity cross-over from mononuclear to dinuclear of Cu(II) complex. This phenomenon is due to the removal/exchange of water/solvent molecules and subsequent structural rearrangement in the crystalline phase. The reactions of HL with Ni(OAc)2·H2O and Ag(OAc)·H2O afforded the formation of 1-D coordination polymer, [NiL2(µ-H2O)2(H2O)2]n·nH2O (3) and dinuclear complex [Ag2(µ-L)2(H2O)2] (4), respectively. Photoluminescence analysis on complex 4 reveals that this dinuclear has potential as a ratiometric luminescent temperature sensor.